Fuel Cost App

Know your vehicle

Gas mileage calculator

Find your actual fuel economy from the distance you drove and the fuel you used.

Your fill-up

Full tank to full tank

Use the fuel added at your next full fill-up and the distance driven since the previous full fill-up.

How to measure gas mileage accurately

  1. Fill your tank and reset your trip odometer.
  2. Drive as usual.
  3. At the next fill-up, fill to the same level and note the fuel added.
  4. Enter the distance since the first fill-up and the amount added at the second.

Do not use the total tank capacity unless that is the amount you actually used. Averaging several fill-ups gives a more representative picture than a single short trip.

MPG and fuel consumption formulas

MPG (US) = miles driven ÷ US gallons used. For example, 300 miles using 10 US gallons equals 30 MPG.

L/100 km = liters used ÷ kilometers driven × 100. Lower L/100 km means less fuel consumed; higher MPG or km/L means better fuel economy.